1 | /* vi: set sw=4 ts=4: */
|
---|
2 | /*
|
---|
3 | * tune2fs: utility to modify EXT2 filesystem
|
---|
4 | *
|
---|
5 | * Busybox'ed (2009) by Vladimir Dronnikov <dronnikov@gmail.com>
|
---|
6 | *
|
---|
7 | * Licensed under GPLv2, see file LICENSE in this source tree.
|
---|
8 | */
|
---|
9 | #include "libbb.h"
|
---|
10 | #include <linux/fs.h>
|
---|
11 | #include <linux/ext2_fs.h>
|
---|
12 |
|
---|
13 | // storage helpers
|
---|
14 | char BUG_wrong_field_size(void);
|
---|
15 | #define STORE_LE(field, value) \
|
---|
16 | do { \
|
---|
17 | if (sizeof(field) == 4) \
|
---|
18 | field = SWAP_LE32(value); \
|
---|
19 | else if (sizeof(field) == 2) \
|
---|
20 | field = SWAP_LE16(value); \
|
---|
21 | else if (sizeof(field) == 1) \
|
---|
22 | field = (value); \
|
---|
23 | else \
|
---|
24 | BUG_wrong_field_size(); \
|
---|
25 | } while (0)
|
---|
26 |
|
---|
27 | #define FETCH_LE32(field) \
|
---|
28 | (sizeof(field) == 4 ? SWAP_LE32(field) : BUG_wrong_field_size())
|
---|
29 |
|
---|
30 | //usage:#define tune2fs_trivial_usage
|
---|
31 | //usage: "[-c MOUNT_CNT] "
|
---|
32 | ////usage: "[-e errors-behavior] [-g group] "
|
---|
33 | //usage: "[-i DAYS] "
|
---|
34 | ////usage: "[-j] [-J journal-options] [-l] [-s sparse-flag] "
|
---|
35 | ////usage: "[-m reserved-blocks-percent] [-o [^]mount-options[,...]] "
|
---|
36 | ////usage: "[-r reserved-blocks-count] [-u user] [-C mount-count] "
|
---|
37 | //usage: "[-L LABEL] "
|
---|
38 | ////usage: "[-M last-mounted-dir] [-O [^]feature[,...]] "
|
---|
39 | ////usage: "[-T last-check-time] [-U UUID] "
|
---|
40 | //usage: "BLOCKDEV"
|
---|
41 | //usage:
|
---|
42 | //usage:#define tune2fs_full_usage "\n\n"
|
---|
43 | //usage: "Adjust filesystem options on ext[23] filesystems"
|
---|
44 |
|
---|
45 | enum {
|
---|
46 | OPT_L = 1 << 0, // label
|
---|
47 | OPT_c = 1 << 1, // max mount count
|
---|
48 | OPT_i = 1 << 2, // check interval
|
---|
49 | };
|
---|
50 |
|
---|
51 | int tune2fs_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
|
---|
52 | int tune2fs_main(int argc UNUSED_PARAM, char **argv)
|
---|
53 | {
|
---|
54 | unsigned opts;
|
---|
55 | const char *label, *str_c, *str_i;
|
---|
56 | struct ext2_super_block *sb;
|
---|
57 | int fd;
|
---|
58 |
|
---|
59 | opt_complementary = "=1";
|
---|
60 | opts = getopt32(argv, "L:c:i:", &label, &str_c, &str_i);
|
---|
61 | if (!opts)
|
---|
62 | bb_show_usage();
|
---|
63 | argv += optind; // argv[0] -- device
|
---|
64 |
|
---|
65 | // read superblock
|
---|
66 | fd = xopen(argv[0], O_RDWR);
|
---|
67 | xlseek(fd, 1024, SEEK_SET);
|
---|
68 | sb = xzalloc(1024);
|
---|
69 | xread(fd, sb, 1024);
|
---|
70 |
|
---|
71 | // mangle superblock
|
---|
72 | //STORE_LE(sb->s_wtime, time(NULL)); - why bother?
|
---|
73 |
|
---|
74 | // set the label
|
---|
75 | if (opts & OPT_L)
|
---|
76 | safe_strncpy((char *)sb->s_volume_name, label, sizeof(sb->s_volume_name));
|
---|
77 |
|
---|
78 | if (opts & OPT_c) {
|
---|
79 | int n = xatoi_range(str_c, -1, 0xfffe);
|
---|
80 | if (n == 0)
|
---|
81 | n = -1;
|
---|
82 | STORE_LE(sb->s_max_mnt_count, (unsigned)n);
|
---|
83 | }
|
---|
84 |
|
---|
85 | if (opts & OPT_i) {
|
---|
86 | unsigned n = xatou_range(str_i, 0, (unsigned)0xffffffff / (24*60*60)) * 24*60*60;
|
---|
87 | STORE_LE(sb->s_checkinterval, n);
|
---|
88 | }
|
---|
89 |
|
---|
90 | // write superblock
|
---|
91 | xlseek(fd, 1024, SEEK_SET);
|
---|
92 | xwrite(fd, sb, 1024);
|
---|
93 |
|
---|
94 | if (ENABLE_FEATURE_CLEAN_UP) {
|
---|
95 | free(sb);
|
---|
96 | }
|
---|
97 |
|
---|
98 | xclose(fd);
|
---|
99 | return EXIT_SUCCESS;
|
---|
100 | }
|
---|